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Mirrors > Home > MPE Home > Th. List > Mathboxes > dfon2lem1 | Structured version Visualization version GIF version |
Description: Lemma for dfon2 34833. (Contributed by Scott Fenton, 28-Feb-2011.) |
Ref | Expression |
---|---|
dfon2lem1 | ⊢ Tr ∪ {𝑥 ∣ (𝜑 ∧ Tr 𝑥 ∧ 𝜓)} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | truni 5281 | . 2 ⊢ (∀𝑦 ∈ {𝑥 ∣ (𝜑 ∧ Tr 𝑥 ∧ 𝜓)}Tr 𝑦 → Tr ∪ {𝑥 ∣ (𝜑 ∧ Tr 𝑥 ∧ 𝜓)}) | |
2 | nfsbc1v 3797 | . . . . 5 ⊢ Ⅎ𝑥[𝑦 / 𝑥]𝜑 | |
3 | nfv 1917 | . . . . 5 ⊢ Ⅎ𝑥Tr 𝑦 | |
4 | nfsbc1v 3797 | . . . . 5 ⊢ Ⅎ𝑥[𝑦 / 𝑥]𝜓 | |
5 | 2, 3, 4 | nf3an 1904 | . . . 4 ⊢ Ⅎ𝑥([𝑦 / 𝑥]𝜑 ∧ Tr 𝑦 ∧ [𝑦 / 𝑥]𝜓) |
6 | vex 3478 | . . . 4 ⊢ 𝑦 ∈ V | |
7 | sbceq1a 3788 | . . . . 5 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ [𝑦 / 𝑥]𝜑)) | |
8 | treq 5273 | . . . . 5 ⊢ (𝑥 = 𝑦 → (Tr 𝑥 ↔ Tr 𝑦)) | |
9 | sbceq1a 3788 | . . . . 5 ⊢ (𝑥 = 𝑦 → (𝜓 ↔ [𝑦 / 𝑥]𝜓)) | |
10 | 7, 8, 9 | 3anbi123d 1436 | . . . 4 ⊢ (𝑥 = 𝑦 → ((𝜑 ∧ Tr 𝑥 ∧ 𝜓) ↔ ([𝑦 / 𝑥]𝜑 ∧ Tr 𝑦 ∧ [𝑦 / 𝑥]𝜓))) |
11 | 5, 6, 10 | elabf 3665 | . . 3 ⊢ (𝑦 ∈ {𝑥 ∣ (𝜑 ∧ Tr 𝑥 ∧ 𝜓)} ↔ ([𝑦 / 𝑥]𝜑 ∧ Tr 𝑦 ∧ [𝑦 / 𝑥]𝜓)) |
12 | 11 | simp2bi 1146 | . 2 ⊢ (𝑦 ∈ {𝑥 ∣ (𝜑 ∧ Tr 𝑥 ∧ 𝜓)} → Tr 𝑦) |
13 | 1, 12 | mprg 3067 | 1 ⊢ Tr ∪ {𝑥 ∣ (𝜑 ∧ Tr 𝑥 ∧ 𝜓)} |
Colors of variables: wff setvar class |
Syntax hints: ∧ w3a 1087 ∈ wcel 2106 {cab 2709 [wsbc 3777 ∪ cuni 4908 Tr wtr 5265 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3an 1089 df-tru 1544 df-ex 1782 df-nf 1786 df-sb 2068 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ral 3062 df-rex 3071 df-v 3476 df-sbc 3778 df-in 3955 df-ss 3965 df-uni 4909 df-iun 4999 df-tr 5266 |
This theorem is referenced by: dfon2lem3 34826 dfon2lem7 34830 |
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